That just plain sucks. I am so very new at this so I have a few questions in regards to such a situation. 1) Does reporting them do any good at all? and 2) What does Riot do in response?
My own situation was different. I played only my second live match ever the other day. I am a noob and know it. I am trying to learn this game. One of the people that joined my group obviously had extensive play before running in a new account. Long story short he was all over my case. Did I die? Yes, six times but I also had a kill and 10 assists (playing MF). I am thick skinned so what he said didn't bother me but why even play in a game when you know noobies will be present trying to learn as they make mistakes? What is the purpose in that?

Ego? By the way, we also won.
On a side note, I admire you guys who can play smart, fast, and furious.